Re: Question regarding smtpd DNS resolution

2018-02-06 Thread Matus UHLAR - fantomas
On Feb 5, 2018, at 05:26, Allen Coates wrote: Is this a reliable bad-host detector? On 05.02.18 12:20, LuKreme wrote: It is a very good indicator of spam. It is also an indicator of a misconfigured mail server (in the case of spammers, intentionally so). I

Re: Question regarding smtpd DNS resolution

2018-02-05 Thread LuKreme
On Feb 5, 2018, at 05:26, Allen Coates wrote: > > Is this a reliable bad-host detector? It is a very good indicator of spam. It is also an indicator of a misconfigured mail server (in the case of spammers, intentionally so). Anyone kitting this error on your

Re: Question regarding smtpd DNS resolution

2018-02-05 Thread Karol Augustin
On 2018-02-05 12:26, Allen Coates wrote: > On 05/02/18 00:12, Viktor Dukhovni wrote: >> >> >>> On Feb 4, 2018, at 5:46 PM, J Doe wrote: >>> >>> Feb 4 15:05:46 server postfix/smptd[718]: warning: hostname >>> 1-2-3-4.dyn.isp.net does not resolve to address 1.2.3.4: Name

Re: Question regarding smtpd DNS resolution

2018-02-05 Thread Allen Coates
On 05/02/18 00:12, Viktor Dukhovni wrote: > > >> On Feb 4, 2018, at 5:46 PM, J Doe wrote: >> >> Feb 4 15:05:46 server postfix/smptd[718]: warning: hostname >> 1-2-3-4.dyn.isp.net does not resolve to address 1.2.3.4: Name or service not >> known >> >> Does this

Re: Question regarding smtpd DNS resolution

2018-02-04 Thread Viktor Dukhovni
> On Feb 4, 2018, at 5:46 PM, J Doe wrote: > > Feb 4 15:05:46 server postfix/smptd[718]: warning: hostname > 1-2-3-4.dyn.isp.net does not resolve to address 1.2.3.4: Name or service not > known > > Does this mean that: > > 1. smtpd receives a connection from an